[Kracka]

Until you learn more and do some more research it would be best for you to leave both the AFC and MBC alone. I am more than willing to help you out, but you also need to do a lot of research on your own. Before anything can be changed, you will need some way of monitoring the car and engine. On the AFC each knob corresponds to a certain RPM-range. Turning the knob counter-clockwise leans the engine out and clockwise richens up the mixture. Like I said though, don't touch it yet.